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Advisories & recorded fixes

medium6.3
CVE-2026-104436

Zebra before 4.5.0 CPU Amplification via Uncapped getblocks/getheaders Locator Length

Zebra before 4.5.0 contains an uncontrolled resource consumption vulnerability that allows remote P2P peers to exhaust blocking-pool threads by sending oversized block locator vectors. Attackers can send getblocks or getheaders messages with up to 65,535 locator hashes, triggering per-hash chain lookups that degrade block validation, RPC, and mempool performance.

No structured fix or guidance is available here. Check the latest publisher advisory.

Exploitation not established

ZcashFoundation · zebra / ZcashFoundation · zebra-chain